Question

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Answer 1

atom has

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orbit

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electrons

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nagative charge

Explanation:

atom has

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nucleus

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proton neutron

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positive charge no charge

Answer 2

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Kinetic energy - The energy possessed by virtue of its motion is said to be kinetic energy.

$kinetic \: energy = \frac{1}{2} m {v}^{2}$

Derivation : We know that,

W = F x s          

but F = ma

W = mas    ….. (1)

By 3rd eqn of motion,

${v}^{2} - {u}^{2}   = 2as$

at rest, u=0

${v}^{2}  = 2as$

$as = \frac{1}{2} {v}^{2}$

Substituting in eqn 1, we get,

$W = \frac{1}{2} m {v}^{2}$

Since work done is stored in kinetic energy.

so,

$kinetic \: energy = \frac{1}{2} m {v}^{2}$

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